RE: RAC 11gR1 changing control files

That's the question that I answered.
It won't work, cause Oracle will insist that all RAC instances have the same
value for control_files parameter.
If you check the manual page for control_files parameter, it's a documented
restriction:
http://download.oracle.com/docs/cd/E11882_01/server.112/e17110/initparams035.htm#REFRN10021
-Mark
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of CRISLER, JON A
Sent: Wednesday, September 07, 2011 1:08 PM
To: Chitale, Hemant Krishnarao
Cc: oracle-l@xxxxxxxxxxxxx; EAGLESTON, BRENDA
Subject: RE: RAC 11gR1 changing control files
Actually, what I was trying to describe is the following process, and get
opinions if it will work:
1) alter parameter "control_files" scope=spfile to remove 1 of the control
files- there will still be at least 3 left.
2) shutdown and restart each instance of a RAC cluster one at a time, in a
rolling fashion.
-----Original Message-----
From: Chitale, Hemant Krishnarao [mailto:Hemant.Chitale@xxxxxx]
Sent: Tuesday, September 06, 2011 9:57 PM
To: CRISLER, JON A
Cc: oracle-l@xxxxxxxxxxxxx
Subject: RE: RAC 11gR1 changing control files
Interesting idea. Drop a controlfile in a rolling manner.
Unfortunately, it won't work. The controlfile is, in a sense, "outside" of the
database --- it actually allows the Instance to identify the physical
components of the Database. Thus, there is no "DROP CONTROLFILE" or "ALTER
CONTROLFILE OFFLINE" command.
You will have to shutdown all the instances of the database, edit the parameter
file and restart the instances.
Ouch !
Hemant K Chitale
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of CRISLER, JON A
Sent: Wednesday, September 07, 2011 4:24 AM
To: 'oracle-l@xxxxxxxxxxxxx'
Subject: RAC 11gR1 changing control files
I ran into a situation where we have 5 control files, and one of these control
files is going into a ASM diskgroup used for online redo logs. We are also
using a storage snapshot product (NetApp Snapshot Manager for Oracle).
Normally the product would not get a snapshot on a volume that only has redo,
but since it has a control file on it, we are then forced to track snapshots
for redo, which is very expensive in resources. The fix is to drop the control
file from that ASM diskgroup.
Which brings me to my question: can I change the control_file parameter to omit
that specific control file (I will still have 4 other copies) and bounce the
instances in a rolling fashion? Or do all instances have to be shutdown so that
the control file parameter is always consistent ?
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